Key Findings
Scientists at the Research Center for Materials Nanoarchitectonics (MANA), part of Japan’s National Institute for Materials Science (NIMS), have demonstrated that atomic-scale steps can act as microscopic rails to guide the movement of quantum vortices in ultrathin superconductors. Under specific conditions, these vortices moved more than 1,000 times more easily along the steps than across them. The team found that this guiding effect is tunable by adjusting the magnetic field or temperature.
Technical Details
The research team, led by Takashi Uchihashi, utilized scanning tunneling microscopy to image the atomic-level surface of an ultrathin superconductor, confirming that the atomic steps ran parallel to one another. To quantify the movement, the team employed four-terminal resistance measurements.
- One-Dimensional Pinning-Free Flow: When the magnetic field was between approximately 0.10 and 0.20 T, vortices flowed freely along the steps without being trapped by material imperfections.
- Quantum Tunneling: At the lowest temperatures, the researchers observed that vortex motion was governed by quantum tunneling, allowing objects to pass through energy barriers that would typically block movement under classical physics.
Background & Context
Superconductors carry electricity without resistance below a critical temperature, but they are susceptible to the formation of quantum vortices where magnetic fields penetrate the material. These vortices create regions of circulating electrical currents; when they move, they can generate electrical resistance and degrade the performance of the superconductor. Controlling these vortices has been particularly challenging in two-dimensional, ultrathin superconductors.
Significance & Outlook
The ability to use surface features only one atom high as natural guiding tracks provides a method for controlling quantum behavior with high precision. While practical applications require further development, this approach to managing vortex movement and heat flow could lead to the development of superconducting electronics that process information more efficiently and consume significantly less power.
Source: https://www.sciencedaily.com/releases/2026/10/261014072018.htm
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